import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.io.Reader; import java.util.regex.Matcher; import java.util.regex.Pattern; /**  *  * @author Administrator  *  */ public class JavaCode {  private static final String PROJECT_DIR = "C:\\test";  private static int totle = 0;  //总行数      private static int source  = 0;  //代码行数     private static int blank  = 0;  //空白行数      private static int comments = 0; //注释行数  /**   * 读取文件夹内java文件   * @param dir   */  private static void listNext(File dir) {   File[] files = dir.listFiles();   for (int i = 0; i < files.length; i++) {    //判断是否是文件夹，如果是文件夹继续向下检索    if (files[i].isDirectory()) {     listNext(files[i]);    } else {     try {      if (files[i].getName().endsWith(".java")) {       System.out.println(files[i].getAbsolutePath());       javaLine(files[i]);      }     }catch (Exception e) {      e.printStackTrace();     }    }   }  }  /**   * 读取java文件总行数，代码行数，空白行数，注释行数   * @param f   * @throws IOException   * @throws FileNotFoundException   */  private static void javaLine(File f) throws FileNotFoundException, IOException{   String strLine = "";   String str = fromFile(f);   if (str.length() > 0) {    while (str.indexOf('\n') != -1) {     totle++;     //System.out.println(totle);     strLine = str.substring(0, str.indexOf('\n')).trim();     //str = str.substring(str.indexOf('\n') + 1, str.length());     if (strLine.length() == 0 ) {      blank++;     }else if (strLine.charAt(0) == '*' || strLine.charAt(0) == '/') {      comments++;     }else{      source++;      String regEx = "^*//";      if(regEx(strLine,regEx)){       comments++;      }     }     str = str.substring(str.indexOf('\n') + 1, str.length());    }   }   }  /**   * 将java文件以字符数组形式读取   * @param f   * @return   * @throws FileNotFoundException   * @throws IOException   */  private static String  fromFile(File f) throws FileNotFoundException,IOException {   FileInputStream fis = new FileInputStream(f);   byte[] b = new byte[(int) f.length()];   fis.read(b);   fis.close();   return new String(b);  }  /**   * 正则匹配   * @param str 输入字符串   * @param regEx 正则匹配字符串   * @return   */  private static boolean regEx(String str,String regEx){   Pattern p=Pattern.compile(regEx);   Matcher m=p.matcher(str);   boolean result=m.find();   return result;  }  public static void main(String[] args) throws FileNotFoundException, IOException {   //File root = new File(PROJECT_DIR);   File directory = new File("");//参数为空   //获取项目路径   String projectFile = directory.getCanonicalPath() ;   System.out.println(projectFile+"===============");   listNext(new File(projectFile));   System.out.println(totle+1);   System.out.println(source);   System.out.println(blank);   System.out.println(comments);  } }